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    Low-Temperature Belt Dryer

    DLT Series

    Centrisys DLT Low-Temperature Sludge Dryer - Focused on the USA

    The DLT is not a drastic redesign. Our dryer development team, industry consultants, and industrial experts researched current dryers on the market and identified key areas in low-temperature dryers that would benefit from improvement. The result is a simplified, operator-friendly, low-temperature belt dryer that maximizes uptime – all done in a smaller footprint.


    A low-temperature sludge dryer is like a gigantic pizza oven.” 

    Hiroko "Yoshi" Yoshida, Ph.D., R&D Director
    Biosolids Expert + Environmental Process Specialist

    Centrisys DLT Low Temperature Belt Dryer

    The DLT is a closed-loop belt dryer that uses hot water as its primary heating source. The water loop is heated to ~190 °F; the head source is typically a boiler system but CHPs or turbines can be used. To transfer the heat from the hot water loop into the dryer, air is forced across heat exchangers into the dryer.

    Drivers for Low-Temperature Dryers

    • Generate Class A Biosoilds - dry sludge at a high temperature to destory pathogens
    • Reduce sludge volume
    • Reduce costs for disposal, landfill, and transportation
    • PFAS regulations


    • Dried sludge with a dryness level up to +90%
    • Reduced biosolids weight up to +80%
    • Meets Class A requirements
    • Optimized particle size creates minimal dust; allows for land application without further processing

    DLT Front-Right-ART


    Why Choose the Centrisys DLT Low-Temperature Belt Dryer?

    USA Parts and Service. Centrisys DLT is designed, built, and FOCUSED on USA plants
    • The dryer’s modular segments are intentionally sized to use standard USA parts
    • All parts and components are manufactured, sourced, and distributed in the USA
    • All parts and components are stocked at the Centrisys parts distribution facility in Kenosha, Wisconsin
    • Parts are standard USA – no custom-sized parts, components, or ancillary equipment.
    Smallest Footprint. Increase Flexibility for Plant Design and Expansion.
    • A low-profile feeder design minimizes height requirements for installation
    • A decentralized heat recovery system; it's a modular cartridge system integrated into the dryer
    • The advanced design of the heat recovery system decreases the installed footprint
    • The heat exchanger is an integrated module within the dryer system; the modular design is a more simplistic approach for dryer sizing to align with plant capacity requirements
    Enhanced Safety, Designed for Plant Operators.
    • Designed to meet NFPA 820/654 standards
    • OSHA compliance for no surface +120 °F
    • All the motor parts and instrumentation meet Class II explosion proof requirements
    • An automated sprinkler system installed for safety
    Uncomplicated. Designed for Simple Maintenance.
    • No confined spaces, operators do not need to crawl inside the dryer box for maintenance
    • Internal dryer parts are accessible and removable from outside the box
    • The compact pull-out cartridge is designed for a one-person "swap-in-place" exchange
    • The primary heat exchanger is a two-piece, split height panel design
    • All doors are hinged, no special tools are needed
    • An optional lift crane assembly to move heavier parts
    • 24/7 operation with minimal operator attention required

    More Uptime. Creates the Most Dried Sludge.

    Problem: Typical low-temp dryer designs have heat recovery systems that are large, stand-alone, and located outside the dryer system. During cleaning, the entire dryer must stop to complete this maintenance task.

    Solution: In the DLT’s Heat Recovery System, each module has an individual heat exchanger. If a single heat exchanger within the module requires cleaning, the DLT system continues to dry sludge. Only the individual module stops. It's a simple, one-person swap of the cartridge.

    Available Literature


    DLT Series



    DLT Series Innovation Timeline



    Advanced Biosolids Treatment



    Centrisys/CNP Company Backgrounder


    Access our GA Drawings